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Buffer (FIFO) overflows

03-Aug-2021

In some cases CPU is not able to stream the trace data quickly enough which results in overflow errors. Errors are  displayed in the Analyzer Output window and indicated in the Trace window with brown coloured lines. 


Possible solutions:

1. Limit the scope of the recorded variables

(e.g. task/irq switches, functions, runnables). For example, configure Code Areas/Data Areas in the Analyzer Configuration dialog / Profiler tab.


2. Disable Program Flow tracing

Unchecking the Analyzer Configuration dialog:

    • Code in the Profiler tab.
    • Coverage in the Hardware tab.


    3. Aurora Trace Port (if used) - Use maximum number of lanes:

      Increase Lane link speed in Hardware menu / CPU Options / Aurora tab.


      4. Nexus Trace Port (if used):
      • Use full trace port width available on your target and Increase MDO width in Hardware menu / CPU Options / Nexus tab.
      • Select the highest possible trace clock  in Hardware menu / CPU Options / Nexus tab:
        • If supported, select double data rate.
        • Decrease the clock divider. 


        5. Decrease the amount of branch/call instructions. 

        An idle loop in the code constantly calls a function which returns immediately. Such programming generates excessive amounts of messages and prevents long recordings. For example, instead of:

        void Idle()
        {
        }

        while(true)
        {
          Idle();
        }

        write

        while(true)
        {
        }

        Limitations inside the CPUs also exist  (e.g. on some CPU architectures only 1-bit Aurora is supported). Generated data can fill the internal buffer even before the BlueBox is able to fetch the data from the CPU. It is necessary to find a balance between the accuracy of recorded data and how much information to record. 


        More resources: 

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